Brush structure



H` H. WAIT.

BRUSH STRUCTURE.

APPLICATION man Aus.22. 1917.

Patented Dec. 28, 1920.

UNITED S'lhltl'l` HENRY H. NAIJL 0F CHICAGO, ILLINOIS.

BRUSH STRUCTURE.

Application filed August 22, 1917.

To all LU/wm t may concern:

Be it known that I, HENRY H. VVArr, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful mprovement in Brush Structures, of which the following is a full, clear, concise, and exact description.

My invention relates to brush structures for dynamo electric machines and has for its general object the provision of a construction whereby a coiled tension spring may be made effective in applying feeding pressure to the contacting member of the brush structure. My employment of a tension coiled spring enables me to provide asafe limit to which the feeding pressure of the spring may be increased, -this being an advantage over a feeding compression coiled spring. My invention also has for its object the provision of an improved means for associating the spring with the contacting member and the brush holder. My invention in all of its characteristics will be fully set forth by reference to the preferred embodiment thereof shown bv the accompanying drawing, in whieh Figure l is a side elevation illustrating a brush structure in working position, a feeding member being indicated in an alternative position by dotted lines, to permit the contacting member of the brush structure to be removed;

Fig. 2 is a side elevation illustrating an arrangement of parts whereby the contacting member of the brush structure, while still in assembly with the balance of the structure, may be held in position without being forced against the commutator (or rotating terminal structure of the dynamo), so that the commutator may be sand-papered, or have other work done upon it, while the brushes are held out of working contact with it;

Fig. 8 is a plan View of the brush structure as it appears in F ig. l, and

Fig. 4 is a view on line 4-4 of Fig. 1.

Like parts are indicated by similar characters of reference throughout the different figures.

The brush structure illustrated includes a brush holder l that has a split sleeve portion 2 whereby the brush holder may be supported upon a cylindrical stud 3 (lixealy mounted on a suitable carrier, not shown). The sleeve has projecting ears e that are Specification of Letters Eatent.

Patented Bec. 28, 1920.

Serial No. 187,648.

located on opposite sides of the gap or split 5 in the sleeve. rfhe stein of the clamping bolt G passes freely through the outer ear et into threaded engagement with the other ear. Upon loosening the bolt the brush holder be swung to any suitable position, in which it i secured by tightening the bolt to clamp the sleeve 2 upon the stud 3. The

l end of the brush holder, opposite that end which is fixed to the stud 3, is provided with a slee 'e which is inclined or otherwise suitably directed toward the commutator 8. The contacting member 9 of the brush structure is of any preferred or suitable construction and is disposed in the bore of the sleeve 7 in which the contacting member is free to move lengthwise of such sleeve 7.

The contacting member 9 of the brush structure is maintained in contact with the commutator by i cans of a coiled or heli tension spring lO. One end of the spring is anchored to side of the holder l that is nearer the commutator this anchorage being desirably effected by engaging the helices at the inner end of the spring with corresponding helical grooves or threads in the holder. The helices at the outer or free end of the spring are in threaded engagement with a nut ll that is disposed within the bore of the spring. The threaded stem of an adjusting screw 12 is in engagement with the threaded bore of the nut. rl`he nut will not readily turn in the spring l0, so that the screw may be turned with respect to the nut to adjust the amount of the screw that projects beyond the spring. The head of the screw 13 is provided with ridges or knife edges let which bear upon the feeding bar l5 that is employed for transmitting the pressure of the spring to the conta ting member. One end of the feeding bar rests upon the upper end of the contacting member 9 and has knife vedge engagement therewith, while the other end of the bar rests upon and has knife edge engagement with a pbrtion of the brush holder that is adjacent the mounting stud 3, the knife edges lli upon the screw head 13 engaging an intermediate portion of this bar. T he feeding bar l5 has a transverse depression l5 constituting the home seat for the knife edges lil to prevent the screw head from turning after it is adjusted. rEhe feeding bar is desirably of U- shape, one end being substantially in the line of the feeding movement of the contacting member 9 and engaging the outer end e1 this member. rllhe oher end of Jdie eed- 111 ber may be placed iii 111g ber 1s 'erilee with knife edge 1G, which 1l 1'11 Fig. 2 Where the 1s 11e1'111elly seied iii a iieched l? 111 f fd ns e11lf1z1gi11g 11 side lie adiliceiit side eli' 111e 1el le1 l. '.1 he 11 0^ uber with sm'iciemb 1 ccmecl beween rl e p17V his member in assem- 70 ber md 'the parts @11 c e e 1 bly iler but Without el.'- iis 1s also the area e screwT fee 1 i the e011- head 18 "chst occurs :1L le i 111e111 with the merme hate ieec 111g b 11 Jer muy be l0 bei* 1111011 the eidev 1Q r he zuid otherwise Worked 75 eedmg bnr 1s hiis ve f screw le is premded 111 L, 111 case e pig-1111i is te be c011- feeii the ielder zuid the contacti ber sitieii as the e111@- Ward the cemmu' e115 F1113 friction.

1k actiiw member 9 is be.YY have bei-ein Sheri-11 and pnrtieu- 80 "a ne de angle with respec y crib f JL' e prei'errcd embed1111e11 0l: leading 'C `ce ,l wish te be limited *no el? ceiistruetieii shenii, es

meting r L `lily be made Wiheut dedirection pui i1it e'f my invention, but 8* the conte hm 'rec my juve-milieu l: claim in 51s te secure by Letters Fal;-

Jbir c1111 sir l. Aucture for (157.112.1110 electric 525 meclimes iiiclvdiiig a, brush helder; 1L e011- 90 member. meting e .1 f1 rush helder Screw leed 13, by fGdSOJ Of iS Gl- H11-deli cycled ifi-e111 :1nd at n.11 Aed` Wizll alle feedil` bei le pleCeS die :wie mw'le Wiih respect 11o Adie leading' face l() under tension7 the degree e 1 l l 3e D bv 'fmriiiiig die sere 1* heed. o; 1;1 :e el? 11h e cenecting m ,mbe 5 :1 bodily 95 ement to Which the Aisiei ef the sL l i mfr-Wilde Afee 1.." 5 ,myX/,1* lani'lfe edge e11- -increased is limiged by the feeding; ber @agement .1 I' l V l f l led 0111er end olf which is iniergesed between the 0111er e11d 1111110011311 n i@ hg] 1,@3-5 nl n ef the spring and Jche lmii'fe edees le 11p-:111 y .wech-1d :it om end '-15 the seres7 heed. By thus l'. i lHT/G @d20 H- 100 temi te Which the ceiisien e'f L s111111@ may ce 01'? h@ l eding; be increased a safe limi is defined `le ehe s111611, L

iedi 111e ilie ends e' such l 111'.

ceniaceiiig member this being L,1 mperaiit 1 i l e L)ressure which may be T111 i ed 'to 'the A bush siucure 'for dynamo electric i ybines including' brush holder; 2L C011- e advantage the emplejiien; ef a. 'ensieii sacinp; member cA 1 n eem* i'essieii i015 eX- 11 feeding bar having' 011e eiid in engagement 1g press 1111011 the cen-110,511@ with the brush helder and lthe other e11d i11 engagement wih 'the contacting member,

` l be observed tha the end of Jche 011e `i d ese e11dsl11wi11gk11ife edge e11 Qefeeding bar fiat engages lhe brush helde mem Wim the pai.; it engges7 this e111 be- 110 is Wider han 111@ r j:han i elier 1 Ad e1: 11e 'feediii *l f1 "1 '1n c 'fwfb c' o, b J1 L bull ufl u' m .111 e e1. ic censceiiii mem e1 se 11b if-, a spring gagging a m1(4 p01 ien there ety a tripod engagementef e1 l feeding bei' i0 held its ends in e11- elie fe Wlih the brush helder a? d fe'z'ee 11'1'.

5G conte :Tiber that enables this bnr te 3. A brush slgrucliure for dyneiiio electric 115 assieme its proper level er position which 1s mech Tees including brush helder; e c011- mainmiied by the ec'ien 01"' Jdie serie pressing 11pe11 the ber.

lf it sheuld be desied to remove the e011n edging member be :feeding i lfacing member cnrri d by the b usb helder; VFeeding ber edjusgnble 1111011 Jche brush er ie here 011e end eiigjegefible with Jche 'J b eh is e y end e" jwhe ceiil'ectiiip; 1i1e111be1- or with 120 arranged i0 be bodily movable, 1s' placed in a side ieee e1 1e ceiitactiiig member er with 1. 1 1v 4.1 n 1.1 1 .1 L i, b U r1 .a L -f 1. .1 11. *i .J l, e u 1^, U L 1 le c1 le@ y LA.' 1 e* e the pesi 1011 101711 y 11 l mes, i110 e s1 e r 1 11 ely fx1 011e side el l1n ille comzzictiiig member;

oiifae be helder7 While he other enc e1C the e s 1 ."iig which maintains the feeding ge/edm@ ber 1s slipped 11110 notch 18 heA l el* is? Jhree adjustmens. 125

1 the helder at o side ef *11e 1Ucure ier dynamo electric it should be desired hold the ,11 v conta ting member i11 assembly with the Anmber carried by jche brush helder; brush helder Without exering spring presf1 l movable feeding; ber having lmi'fe sure 1111011 the outer end of "che contacting edge ene'agement with the contacting mcm- 130 s including f1 brush helder; f1 c011- ber and the holder; and a coiled tension the holder that is notched at diiferent places spring connected at one end with the holder` to hold the bar in different positions; and a and having knife edge engagement With the s oring for maintaining` the bar in assembly outer face of the feeding bar intermediate with the holder in the different positions of 5 the ends of such bar. the' bar. 15

5. A. brush structure for dynamo electric ln Witness whereof, I'hereunto subscribe machines including a brush holder; a conmy name this 18th day of August, A. D.

tacting member carried by the brush holder; 1917.

a feeding bar which is bodily movable to 10 enable it to have different positions upon HENRY H. WAIT. 

